How to enable or disable the noise cancellation feature?

What should I do if the power of the two earbuds is different?

What should I do if the charging time and battery life are different between the two earbuds?

Why is the operating time of my earbuds is getting shorter after using for some time?

How to charge the earbuds? And how long will they take to charge?

What should I do if my device cannot charge or charge slowly?